Contacts of the helix formed by residues 59 - 85 (chain A) in PDB entry 2OI8


Residue contacts within the protein are derived with the CSU software (Sobolev V., Sorokine A., Prilusky J., Abola E.E. and Edelman M. (1999) Automated analysis of interatomic contacts in proteins. Bioinformatics, 15, 327-332). A short description of the analytical approach is given at the end of the page.
For CSU analysis of other PDB entry

Note:
Non-standard 3 letter residue codes indicate a heterogroup. To identify and analyse, use LPC software

Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB   - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC   - hydrophobic-hydrophilic contact (destabilizing contact)
+/-  - indicates presence/absence of a specific contacts
*    - indicates residues forming contacts  by their side chain
       (including CA atoms)
Residues in contact with GLY 59 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     39A  LEU*     3.6    15.2    -      -       -      +
     54A  TYR*     3.6    15.3    -      -       -      -
     57A  PHE*     2.7    11.5    +      -       -      +
     58A  ASP*     1.3    73.6    -      -       -      +
     60A  ARG*     1.3    65.5    +      -       -      -
     61A  ASP      3.2     4.8    +      -       -      -
     62A  GLU*     3.2    13.7    +      -       -      +
     63A  LEU*     3.3     8.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 60 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     35A  SER*     3.8    25.1    +      -       -      +
     37A  LEU*     3.2    31.9    -      -       +      +
     38A  SER*     5.7     0.4    -      -       -      -
     39A  LEU*     3.8    15.9    -      -       +      +
     54A  TYR*     5.1     0.8    +      -       -      -
     59A  GLY*     1.3    71.0    -      -       -      -
     61A  ASP*     1.3    86.3    +      -       -      +
     63A  LEU*     3.3     7.8    +      -       +      +
     64A  ILE*     2.8    46.2    +      -       +      +
    115A  VAL*     3.8    13.9    -      -       -      +
    116A  PRO      3.2    26.3    +      -       -      -
    117A  GLY*     4.5     2.4    -      -       -      -
    118A  TYR*     4.2     6.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 61 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     59A  GLY      3.2     1.2    +      -       -      -
     60A  ARG*     1.3   103.1    +      -       -      +
     62A  GLU*     1.3    54.7    +      -       -      +
     64A  ILE*     3.2     0.3    +      -       -      +
     65A  THR*     2.7    43.1    +      -       -      +
    117A  GLY      4.7     4.2    -      -       -      +
    118A  TYR*     3.2    39.4    -      -       +      +
    119A  ARG      4.9     5.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 62 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     56A  TYR      4.8     0.9    -      -       -      +
     57A  PHE*     3.8    13.5    -      -       +      -
     58A  ASP*     3.1    49.0    +      -       -      +
     59A  GLY      3.2    11.1    +      -       -      +
     61A  ASP*     1.3    78.9    -      -       -      +
     63A  LEU*     1.3    59.8    +      -       -      +
     65A  THR*     3.7     6.6    -      -       -      +
     66A  GLU*     3.2    27.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 63 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     21A  ILE*     4.5     4.3    -      -       +      -
     22A  LYS*     4.0    16.4    -      -       +      -
     25A  ALA*     3.9    22.7    -      -       +      -
     37A  LEU*     4.3    17.3    -      -       +      -
     39A  LEU*     3.9    23.8    -      -       +      +
     42A  ILE*     4.5     5.8    -      -       +      -
     57A  PHE*     3.7    43.0    -      -       +      -
     59A  GLY      3.3     6.0    +      -       -      +
     60A  ARG*     3.3    12.0    +      -       -      +
     61A  ASP      3.2     0.4    -      -       -      -
     62A  GLU*     1.3    75.7    -      -       -      +
     64A  ILE*     1.3    67.2    +      -       -      +
     66A  GLU*     3.2     3.3    +      -       -      +
     67A  LEU*     3.0    32.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 64 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     34A  ALA*     4.8    13.9    -      -       +      -
     35A  SER      5.1     0.2    -      -       -      +
     37A  LEU*     3.3    33.2    -      -       +      -
     60A  ARG*     2.8    41.7    +      -       +      +
     61A  ASP*     3.6     6.5    -      -       -      +
     63A  LEU*     1.3    74.5    -      -       -      +
     65A  THR*     1.3    66.5    +      -       -      +
     67A  LEU*     2.9    12.2    +      -       +      +
     68A  ILE*     2.8    46.6    +      -       +      +
    109A  LEU*     5.1     6.5    -      -       +      -
    115A  VAL*     4.9    14.4    -      -       +      -
    118A  TYR*     3.6    24.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 65 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     61A  ASP*     2.7    26.7    +      -       -      +
     62A  GLU*     3.7     9.1    -      -       -      +
     64A  ILE*     1.3    73.6    -      -       -      +
     66A  GLU*     1.3    59.3    +      -       -      +
     68A  ILE*     3.3     4.8    +      -       -      +
     69A  ARG*     3.0    52.0    +      -       -      +
    118A  TYR*     2.7    25.2    +      -       -      +
    121A  PRO*     3.6    28.4    -      -       +      +
    123A  ASP*     5.4     0.2    -      -       -      +
    124A  ILE*     6.1     3.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 66 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18A  ARG*     6.2     0.9    -      -       -      +
     22A  LYS*     4.4    15.9    +      -       +      +
     57A  PHE*     3.7    27.1    -      -       +      -
     62A  GLU      3.2     8.5    +      -       -      +
     63A  LEU      3.2     9.0    +      -       -      +
     65A  THR*     1.3    78.2    -      -       -      +
     67A  LEU*     1.3    60.1    +      -       -      +
     69A  ARG*     3.4    40.9    +      -       -      +
     70A  ASP*     2.9    41.9    +      -       -      +
     73A  ARG*     4.7     2.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 67 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     22A  LYS*     3.8    37.5    -      -       +      +
     25A  ALA*     4.0    16.4    -      -       +      -
     26A  TRP*     3.5    31.4    -      -       +      +
     29A  ILE*     3.8    28.3    -      -       +      -
     37A  LEU*     4.4     9.4    -      -       +      -
     63A  LEU*     3.0    21.4    +      -       +      +
     64A  ILE*     2.9    10.6    +      -       +      +
     66A  GLU*     1.3    75.8    -      -       -      +
     68A  ILE*     1.3    58.1    +      -       -      +
     70A  ASP*     3.3     7.1    +      -       -      +
     71A  ALA*     2.9    30.0    +      -       -      +
    109A  LEU*     3.8    15.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 68 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     64A  ILE*     2.8    38.2    +      -       +      +
     65A  THR*     3.6     8.1    -      -       -      +
     67A  LEU*     1.3    72.5    -      -       -      +
     69A  ARG*     1.3    62.1    +      -       -      +
     71A  ALA*     3.2     2.9    +      -       -      +
     72A  TYR*     3.0    50.2    +      -       +      -
    109A  LEU*     4.0    30.3    -      -       +      +
    110A  ILE*     3.8    10.1    -      -       +      -
    115A  VAL*     6.0     2.2    -      -       +      -
    118A  TYR*     3.6    24.9    -      -       +      +
    120A  ALA*     5.5     0.9    -      -       +      -
    124A  ILE*     4.2    15.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 69 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65A  THR*     3.0    34.1    +      -       +      +
     66A  GLU*     3.4    35.4    +      -       -      +
     67A  LEU      3.4     0.2    -      -       -      -
     68A  ILE*     1.3    72.5    -      -       -      +
     70A  ASP*     1.3    59.9    +      -       -      +
     72A  TYR*     3.4     9.1    +      -       -      +
     73A  ARG*     3.0    59.7    +      -       -      +
    121A  PRO*     4.9     2.0    -      -       -      +
    123A  ASP*     2.7    38.3    +      -       -      +
    124A  ILE*     6.0     2.9    -      -       -      +
    127A  ILE*     5.4    11.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 70 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     22A  LYS*     2.8    42.6    +      -       -      +
     26A  TRP*     5.5     6.7    +      -       +      +
     66A  GLU*     2.9    19.5    +      -       -      +
     67A  LEU*     3.5     8.9    -      -       -      +
     69A  ARG*     1.3    76.2    -      -       -      +
     71A  ALA*     1.3    62.4    +      -       -      +
     73A  ARG*     3.3    24.7    +      -       -      +
     74A  SER*     3.2    23.6    +      -       -      -
    106A  ARG*     5.4     0.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 71 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     26A  TRP*     4.9     1.8    -      -       +      -
     67A  LEU      2.9    13.6    +      -       -      +
     68A  ILE*     3.2     9.4    +      -       -      +
     70A  ASP*     1.3    74.3    -      -       -      +
     72A  TYR*     1.3    63.9    +      -       -      +
     74A  SER*     2.9    21.3    +      -       -      -
     75A  GLN      3.1     7.4    +      -       -      -
     99A  TRP*     3.6     9.3    -      -       +      -
    106A  ARG*     3.7    28.5    -      -       +      +
    109A  LEU*     4.7     5.6    -      -       +      -
    110A  ILE*     3.7    23.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 72 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68A  ILE*     3.0    45.3    +      -       +      -
     69A  ARG*     3.8     9.0    -      -       -      +
     71A  ALA*     1.3    75.4    -      -       -      +
     73A  ARG*     1.3    58.3    +      -       -      +
     75A  GLN*     3.2    21.2    +      -       -      +
     76A  ALA*     2.9    29.0    +      -       -      +
    110A  ILE*     3.4    37.8    +      -       +      +
    111A  PHE*     5.1     2.5    -      +       -      -
    124A  ILE*     3.4    28.2    +      -       +      -
    125A  THR*     5.7     1.0    -      -       -      +
    127A  ILE*     3.8    21.0    -      -       +      +
    128A  ALA*     3.9    25.3    -      -       +      +
    131A  THR*     3.9     4.7    +      -       -      -
    180A  TRP*     6.2     1.1    -      +       -      -
----------------------------------------------------------
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Residues in contact with ARG 73 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     66A  GLU*     4.7     3.6    +      -       -      -
     69A  ARG*     3.0    54.1    +      -       -      +
     70A  ASP*     3.5    28.0    +      -       -      +
     71A  ALA      3.2     0.6    -      -       -      -
     72A  TYR*     1.3    78.1    -      -       -      +
     74A  SER*     1.3    57.1    +      -       -      +
     76A  ALA*     3.4     6.1    +      -       -      +
     77A  ASP*     2.9    46.6    +      -       -      +
     80A  ARG*     5.3     4.0    -      -       -      +
    127A  ILE*     5.9     3.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 74 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     70A  ASP      3.2    12.5    +      -       -      -
     71A  ALA      2.9    15.1    +      -       -      -
     73A  ARG*     1.3    74.1    -      -       -      +
     75A  GLN*     1.3    65.1    +      -       -      +
     77A  ASP*     3.7    10.3    -      -       -      +
     78A  SER*     3.1    23.7    +      -       -      -
     99A  TRP*     3.3    19.5    +      -       -      -
    106A  ARG*     3.5    22.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 75 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71A  ALA      3.1     8.2    +      -       -      +
     72A  TYR*     3.2    21.7    +      -       -      +
     74A  SER*     1.3    79.5    +      -       -      +
     76A  ALA*     1.3    62.4    +      -       -      +
     78A  SER*     3.5     3.1    +      -       -      -
     79A  LEU*     3.2    24.4    +      -       +      +
     96A  LEU*     3.5    21.4    -      -       +      +
     99A  TRP*     3.3    35.2    -      -       +      +
    110A  ILE*     5.8     0.2    -      -       -      +
    111A  PHE*     3.3    29.5    -      -       -      -
    131A  THR*     3.6    19.4    +      -       +      +
    180A  TRP*     3.1    34.8    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 76 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72A  TYR      2.9    13.5    +      -       -      +
     73A  ARG*     3.6     8.1    -      -       -      +
     75A  GLN*     1.3    75.5    -      -       -      +
     77A  ASP*     1.3    55.4    +      -       -      +
     79A  LEU*     3.7     1.7    -      -       -      +
     80A  ARG*     2.8    58.6    +      -       +      +
    127A  ILE      5.7     0.4    -      -       -      +
    130A  GLU*     4.4     9.4    -      -       +      -
    131A  THR*     3.4    30.7    +      -       -      +
    134A  VAL*     5.5     0.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 77 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     73A  ARG*     2.9    37.1    +      -       -      +
     74A  SER*     3.7     9.5    -      -       -      +
     75A  GLN      3.3     0.4    -      -       -      -
     76A  ALA*     1.3    72.7    -      -       -      +
     78A  SER*     1.3    67.7    +      -       -      +
     80A  ARG*     3.0    33.1    +      -       -      +
     81A  ALA*     3.0    27.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 78 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     74A  SER      3.1    17.5    +      -       -      -
     75A  GLN      3.6     5.4    -      -       -      -
     77A  ASP*     1.3    79.3    -      -       -      +
     79A  LEU*     1.3    63.5    +      -       -      +
     81A  ALA*     3.5     5.5    +      -       -      +
     82A  ALA*     3.3    18.9    +      -       -      +
     95A  ALA*     3.3    30.7    +      -       -      +
     99A  TRP*     3.8    18.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 79 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     75A  GLN*     3.2    16.5    +      -       +      +
     76A  ALA*     3.9     3.6    -      -       -      +
     78A  SER*     1.3    80.8    -      -       -      +
     80A  ARG*     1.3    66.4    +      -       -      +
     82A  ALA*     3.3     6.7    +      -       -      +
     83A  ALA*     3.2    21.7    +      -       -      +
     92A  LEU*     3.9    15.5    -      -       +      +
     95A  ALA*     3.9    20.4    -      -       +      -
     96A  LEU*     3.9    24.2    -      -       +      +
    131A  THR*     3.3    34.3    -      -       +      +
    134A  VAL*     3.9    13.2    -      -       +      +
    135A  ILE*     3.8    26.9    -      -       +      -
    179A  PHE*     5.8     0.7    -      -       +      -
    180A  TRP*     4.7     6.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 80 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     73A  ARG*     4.4     5.7    +      -       -      +
     76A  ALA*     2.8    40.3    +      -       +      +
     77A  ASP*     3.0    33.9    +      -       -      +
     79A  LEU*     1.3    72.2    -      -       -      +
     81A  ALA*     1.3    54.5    +      -       -      +
     83A  ALA*     3.1     5.3    +      -       -      +
     84A  ALA*     2.8    37.8    +      -       +      +
    130A  GLU*     5.7     5.8    -      -       -      +
    134A  VAL*     4.1    20.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 81 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     77A  ASP      3.0    17.2    +      -       -      +
     78A  SER*     3.7     6.7    -      -       -      +
     80A  ARG*     1.3    75.5    -      -       -      +
     82A  ALA*     1.3    56.0    +      -       -      +
     84A  ALA*     3.5     7.1    +      -       -      +
     85A  SER*     3.0    29.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 82 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     78A  SER      3.3    10.7    +      -       -      +
     79A  LEU      3.3     5.8    +      -       -      +
     80A  ARG      3.1     0.4    -      -       -      -
     81A  ALA*     1.3    78.8    -      -       -      +
     83A  ALA*     1.3    58.9    +      -       -      +
     85A  SER*     3.1    11.3    +      -       -      -
     87A  ALA*     3.0    34.1    +      -       +      +
     91A  GLY      4.2     6.7    -      -       -      +
     92A  LEU*     3.4    20.4    -      -       +      -
     95A  ALA*     3.9    18.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 83 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     79A  LEU      3.2     4.6    +      -       -      -
     80A  ARG*     3.1     7.6    +      -       -      +
     82A  ALA*     1.3    73.5    -      -       -      +
     84A  ALA*     1.3    59.6    -      -       -      +
     86A  GLY*     3.0    19.8    +      -       -      -
     87A  ALA      4.3     7.8    -      -       -      +
     92A  LEU*     3.7     9.1    -      -       +      +
    134A  VAL*     3.7    29.6    -      -       +      -
    137A  ASP*     6.4     0.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 84 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     80A  ARG      2.8    19.9    +      -       -      +
     81A  ALA*     3.7     7.6    -      -       -      +
     83A  ALA*     1.3    78.6    -      -       -      +
     85A  SER*     1.3    55.0    +      -       -      +
     86A  GLY      3.2     2.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with SER 85 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     81A  ALA      3.0    15.4    +      -       -      -
     82A  ALA*     3.1    15.1    +      -       -      -
     83A  ALA      3.2     0.4    -      -       -      -
     84A  ALA*     1.3    74.3    -      -       -      +
     86A  GLY*     1.3    58.8    +      -       -      +
     87A  ALA*     3.3     6.9    +      -       -      +
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


   I  Hydrophilic      - N and O that can donate and accept hydrogen bonds
                         (e.g., oxygen of hydroxyl group of Ser. or Thr)
  II  Acceptor         - N or O that can only accept a hydrogen bond
 III  Donor            - N that can only donate a hydrogen bond
  IV  Hydrophobic      - Cl, Br, I and all C atoms that are not in
                         aromatic rings and do not have a covalent bond to
                         a N or O atom
   V  Aromatic         - C in aromatic rings irrespective of any other 
                         bonds formed by the atom
  VI  Neutral          - C atoms that have a covalent bond to at least one
                         atom of class I or two or more atoms from class II
                         or III; atoms; S, F, P, and metal atoms in all cases
 VII  Neutral-donor    - C atoms that have a covalent bond with only one
                         atom of class III
VIII  Neutral-acceptor - C atoms that have a covalent bond with only 
                         one atom of class II
For each pair of contacts the state of legitimacy is shown below:

Legend:
+, legitimate
-, illegitimate
------------------------------------------------------------
  Atomic class           I  II  III   IV   V   VI  VII  VIII
------------------------------------------------------------
   I  (Hydrophilic)      +   +    +    -   +   +    +    +
  II  (Acceptor)         +   -    +    -   +   +    +    -
 III  (Donor)            +   +    -    -   +   +    -    +
  IV  (Hydrophobic)      -   -    -    +   +   +    +    +
   V  (Aromatic)         +   +    +    +   +   +    +    +
  VI  (Neutral)          +   +    +    +   +   +    +    +
 VII  (Neutral-donor)    +   +    -    +   +   +    -    +
VIII  (Neutral-acceptor) +   -    +    +   +   +    +    -
------------------------------------------------------------
Warning!
Atom classes for heterogroups are automatically assigned based on the atomic coordinates. However, in three cases (see below) the automatic assignment is currently ambiguous. In these cases, the user is advised to manually analyse the full list of contacts using LPC software.
1. Carbon atoms belonging to a 4-, 5- or 6-member ring are 
   considered "aromatic" (Class V) if the ring is approximately
   planar, and "hydrophobic" (Class IV) or "neutral" (Classes
   VI, VII, VIII) if the ring is non-planar.
2. The oxygen atom of a carbonyl or hydroxy group is considered
   "hydroxy" (Class I) if the CO bond is longer than 1.29 Å, and
   "carbonyl" (Class II) if shorter.
3. All nitrogen atoms are considered "hydrophilic" (Class I).

Please E-mail any questions and/or suggestions concerning this page to Vladimir.Sobolev@weizmann.ac.il